How much will the ph change

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A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M . A student adds 4.30 mL of a 0.460 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.

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